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Old 04-20-2009   #18 (permalink)
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Re: What is "spacetime" really?

Quote:
Originally Posted by Pyrotex
Clocks measure their own internal changes of state
No, they don't.
Clocks don't measure a thing; we just tell ourselves "clocks keep track of time", but this isn't really the case, we keep track of time, by looking at a clock, or listening to a talking clock, or seeing where the sun is or how dark or light the sky looks.

We're the measurers, measurement isn't something inanimate matter is capable of.
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